diff --git a/sleekxmpp/features/feature_mechanisms/mechanisms.py b/sleekxmpp/features/feature_mechanisms/mechanisms.py
index 48a5de1..5df1ea6 100644
--- a/sleekxmpp/features/feature_mechanisms/mechanisms.py
+++ b/sleekxmpp/features/feature_mechanisms/mechanisms.py
@@ -36,18 +36,17 @@ class feature_mechanisms(base_plugin):
             return 'starttls' in self.xmpp.features
 
         def basic_callback(mech, values):
+            creds = self.xmpp.credentials
             for value in values:
                 if value == 'username':
                     values['username'] = self.xmpp.boundjid.user
                 elif value == 'password':
-                    values['password'] = self.xmpp.credentials['password']
-                elif value == 'access_token':
-                    if 'access_token' in self.xmpp.credentials:
-                        values['access_token'] = self.xmpp.credentials['access_token']
-                    else:
-                        values['access_token'] = self.xmpp.credentials['password']
-                elif value in self.xmpp.credentials:
-                    values[value] = self.xmpp.credentials[value]
+                    values['password'] = creds['password']
+                elif value == 'email':
+                    jid = self.xmpp.boundjid.bare
+                    values['email'] = creds.get('email', jid)
+                elif value in creds:
+                    values[value] = creds[value]
             mech.fulfill(values)
 
         sasl_callback = self.config.get('sasl_callback', None)